<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script type="text/javascript">
			var array1 = new Array(7);
			console.log(array1.length);//7
			var array2 = new Array(100, 'a', true);
			console.log(array2.length);//3
			//构造一个空数组，数组的长度是可变的
			var array = new Array();
			array[0] = '23';
			console.log(array);//['23']
			console.log(array.length);//1
			array[1] = true;
			console.log(array);//['23', true]
			console.log(array.length);//2
			//使用push和pop
			var arr = new Array();
			arr.push('zhangsan');
			console.log(arr);//['zhangsan']
			console.log(arr.length);//1
			arr.push(false);
			console.log(arr);//['zhangsan', false]
			console.log(arr.length);//2
			arr.push(45);
			console.log(arr);// ['zhangsan', false, 45]
			console.log(arr.length);//3
			console.log(arr.pop());//45
			console.log(arr.pop());//false
			console.log(arr.pop());//zhangsan
		</script>
	</body>
</html>